JP2005273478A - Vane rotary type vacuum pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vane rotary type vacuum pump, in which abrasion amount of a vane and an opposed sliding face is reduced to secure high reliability. <P>SOLUTION: Since material of the vane is high-hardness carbon having 80 to 120 of high shore hardness, the abrasion of an inner wall of a cylinder 5 slid with a tip of the vane 8 or the abrasion of the surface of a slit 7 formed in a rotor 6 slid with a side face of the vane 8 is reduced, and crystal structure of the high-hardness carbon has directionality, so that the abrasion of the vane 8 itself is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rotary fluid machine used as an air compressor or a vacuum pump.

  Conventionally, as this kind of vane rotary type pump, there existed what was described in patent documents 1, for example. FIG. 5 shows a configuration of a conventional vane rotary pump described in Patent Document 1. As shown in FIG.

In the figure, an aluminum cylinder 100 is provided with an iron-based thin film 100a on the inner wall, and a suction port 101 and a discharge port 102 are provided. The rotor 103 is configured such that an aluminum vane 104 is slidably moved in a slit 103 a provided in the rotor 103. The vane 104 made of aluminum slides with its tip abutting against the inner wall of the cylinder 100 made of aluminum, and has a pump space 105 formed between the cylinder 100 and a front plate and an end plate (both not shown). I will partition. In such a configuration, power is transmitted from the outside to the rotor 103, the rotor 103 rotates, the refrigerant is sucked from the suction port 101, and the refrigerant is compressed in the pump space 105 and discharged from the discharge port 102.
JP-A-6-33883

  However, in the above-described conventional configuration, the lubricity of the sliding portion of the device uses lubricating oil dissolved in the refrigerant, and between the inner wall of the aluminum cylinder 100 and the tip of the aluminum vane 104 and the side surface of the aluminum vane 104 and the rotor. The smooth sliding between the 103 slits 103a is maintained, but when the lubricating oil is deficient, the aluminum vane 104 is seized at the portion, and the pump cannot be operated. .

  An object of the present invention is to solve the above-mentioned problems and to provide a vane rotary type vacuum pump that is less likely to deteriorate in performance even during long-term operation, is quiet, and has a long service life.

  To achieve the above object, a vane rotary vacuum pump according to the present invention includes a pump mechanism unit and a motor unit that is coupled to the pump mechanism unit and drives the pump mechanism unit via a common shaft. The vane rotary vacuum pump is configured to be slidably held in a cylinder, a rotor that rotates in the cylinder and forms a pump space with the cylinder, and a slit of the rotor. A plate-like vane that variably divides the pump space, a front plate and an end plate that close both ends of the cylinder in the axial direction, and between the vane and the slit of the rotor is oilless, The vane is made of high-hardness carbon or carbon fiber reinforced plastic having self-lubricating property.

  Further, it is preferable that the hardness of the high-hardness carbon forming the vanes is 80 to 120.

  Further, if the stacking direction of the crystal structure of the high-hardness carbon forming the vane is made to coincide with the direction of the rotation center axis of the rotor, it is suitable for reducing wear on the tip and side portions of the vane.

  Furthermore, it is more suitable for reducing the wear of the tip of the vane if the laminated layer of the crystal structure of the high hardness carbon forming the vane is arranged in parallel with the two opposing surfaces of the slit of the rotor.

  Further, when the lamination direction of the fibers of the carbon fiber reinforced plastic forming the vanes is made to coincide with the rotation center axis direction of the rotor, the same effect can be obtained in the case of high hardness carbon.

  Further, the same preferable result can be obtained even if the lamination direction of the fibers of the carbon fiber reinforced plastic forming the vanes is parallel to the two opposing surfaces of the slits of the rotor.

  By using high-hardness carbon for the vane material, lubrication is not required, and the vane tip, the inner wall of the cylinder, the side surface of the vane, and the slit of the rotor can slide smoothly, preventing pump lock due to vane seizure. it can. Further, the amount of wear of the vane can be suppressed, and the life of the vane can be extended and the amount of carbon scraped when the vane slides can be suppressed. And the exhaust pollution discharged from a pump can be suppressed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are cross-sectional views of a vane rotary type vacuum pump in the present embodiment. In the figure, the vane rotary type vacuum pump 1 includes a pump mechanism unit 2, a motor unit 3, and a cooling circuit unit 4. The pump mechanism 2 includes a cylinder 5 having a cylindrical inner wall made of aluminum, a cylindrical rotor 6, a vane 8 slidably held in a slit 7 formed in the rotor 6, and The front plate 10 and the end plate 11 are sandwiched to form a plurality of pump spaces 9. The vanes 8 are made of high-hardness carbon having a defined crystal structure directivity, and the crystal structure is arranged in the direction of the rotation center axis of the rotor 6 as shown in FIG. The rotor 6 is fixed to a shaft 12 as a rotation center axis, and this shaft 12 is connected to the pump mechanism section 2 in common with the rotation center axis of the motor section 3. The rotor 6 is arranged with its center axis and the center axis of the cylinder 5 being eccentric, and the vanes 8 are slidably held in a plurality of slits 7 provided in the direction of the center axis of the rotor 6. .

  The motor unit 3 includes a stator 13, a motor rotor 14, and a motor casing 15. The stator 13 is sandwiched between the end plate 11 of the pump mechanism portion 2 and the motor casing 15, and the motor rotor 14 is disposed therein. The motor rotor 14 is fixed to the common shaft 12, and the shaft 12 is supported by bearings 16 and 17. The bearings 16 and 17 are grease-enclosed ball bearings. The shaft 12 is formed integrally with the pump mechanism portion 2 and the shaft portion of the motor portion 3, and the rotation of the motor rotor 14 is directly transmitted to the rotor 6.

  The cooling circuit unit 4 includes a cooling fan 18 and an air guide 19. The cooling fan 18 is attached to the motor unit 3 side of the shaft 12, and the air guide 19 surrounds the cooling fan 18. . A plurality of through holes 15 a are provided in the axial end surface of the motor casing 15, and the airflow formed by the cooling fan 18 is guided to the motor unit 3 to cool the motor unit 3.

  In the vane rotary type vacuum pump 1 configured as described above, when the motor unit 3 is energized and the motor rotor 14 rotates, this rotational force is transmitted to the shaft 12 and the rotor 6 of the pump mechanism unit 2 also rotates together. Accordingly, the vane 8 slides in the slit 7 of the rotor 6 while the tip of the vane 8 abuts against the inner wall surface of the cylinder 5, thereby partitioning the pump space 9, and performing each step of suction, compression, and discharge. Run and play the pump function.

  Next, the material of the vane 8 will be described. That is, the vane 8 is made of high hardness carbon having a Shore hardness of 80 to 120. Thereby, the amount of wear of the vane 8 itself can be reduced. At the same time, since the carbon is softer than aluminum which is the sliding material, the wear of the inner wall of the cylinder 5 sliding with the tip of the vane 8 and the surface of the slit 7 of the rotor 6 sliding with the side surface of the vane 8 is reduced. And the deterioration of the surface roughness of these parts is suppressed. Then, the deterioration of the sliding noise is reduced, the air leakage due to the lowering of the adhesion between the tip of the vane 8 and the inner surface of the cylinder 5 is reduced, and the aluminum powder generated by the sliding acts on the vane 8 adversely. Abnormal wear of the generated vanes 8 can also be prevented.

  Further, in the present embodiment, as shown in FIG. 3, the stacking direction of the crystal structure of the high hardness carbon of the vane 8 is made to coincide with the rotation center axis direction of the rotor 6. The surface sliding in the direction perpendicular to the direction can be the tip of the vane 8 and the side surface of the vane 8, and the amount of wear on these surfaces can be further reduced, extending the life of the vane 8 and sliding the vane 8. It is possible to suppress the amount of carbon that is sometimes scraped, and to suppress exhaust pollution discharged from the pump.

  Further, a force to bend the vane 8 acts along the stacking direction due to a pressure difference acting on the side surface of the vane 8, but in this embodiment, the vane 8 is resistant to bending in this direction, and the vane 8 is prevented from being damaged and pump lock is prevented. Contribute to.

  FIG. 4 shows another embodiment of the present invention. In this case, the crystal structure stack of the vanes 8 is arranged in parallel with the two opposing faces of the slits 7 of the rotor 6. The amount of wear at the tip of the vane 8 can be reduced by making the surface sliding in the direction perpendicular to the stack of the tip of the vane 8.

  Further, a force for bending the vane 8 due to a pressure difference acting on the side surface of the vane 8 and a force for bending the vane 8 due to a difference in frictional force acting on the lower surface and the upper surface of the vane 8 in the stacking direction of the vanes 8. Although this works, the present embodiment is also strong in bending in this direction, and is effective in preventing the vane 8 from being damaged.

  In any of the embodiments of the present invention, the same effect can be obtained by using a carbon fiber reinforced plastic instead of high hardness carbon as the material of the vane 8.

  The vane rotary vacuum pump according to the present invention does not require lubricating oil by using high-hardness carbon or carbon fiber reinforced plastic as a vane material, and further, contamination of gas discharged by suppressing the amount of vane wear. It can be widely applied to uses such as household health appliances and medical treatment appliances that need to be reduced.

A sectional view of a vane rotary type vacuum pump in one embodiment of the present invention. FIG. 2 is a cross-sectional view taken along line A-A ′ of FIG. 1. The principal part perspective view of the vane rotary type vacuum pump in one Embodiment of this invention. The principal part perspective view of the vane rotary type vacuum pump in other embodiment of this invention. Sectional drawing of the conventional vane rotary type vacuum pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vane rotary type air pump 2 Pump mechanism part 3 Motor part 4 Shaft 5 Cylinder 6 Rotor 7 Slit 8 Vane 9 Pump space 10 Front plate 11 End plate

Claims (6)

A vane rotary type vacuum pump including a pump mechanism unit and a motor unit coupled to the pump mechanism unit and driving the pump mechanism unit via a common shaft, wherein the pump mechanism unit includes a cylinder, A rotor that rotates in the cylinder and forms a pump space with the cylinder; a plate-like vane that is slidably held in a slit of the rotor and variably partitions the pump space; and It has a front plate and an end plate that close both ends in the axial direction, oil-less between the vane and the slit of the rotor, and high-hardness carbon or carbon fiber reinforced plastic having self-lubricating property as the material of the vane. A vane rotary vacuum pump characterized by being used. The vane rotary vacuum pump according to claim 1, wherein the hardness of the high-hardness carbon forming the vane is 80 to 120. 3. A vane rotary type vacuum pump according to claim 1, wherein the stacking direction of the crystal structure of the high hardness carbon forming the vane is made to coincide with the rotation center axis direction of the rotor. 3. A vane rotary type vacuum pump according to claim 1, wherein the crystal structure of the high hardness carbon forming the vanes is arranged in parallel with two opposing surfaces of the slits of the rotor. 2. The vane rotary vacuum pump according to claim 1, wherein a lamination direction of carbon fiber reinforced plastic fibers forming the vane is aligned with a rotation center axis direction of the rotor. 2. The vane rotary vacuum pump according to claim 1, wherein a stack of carbon fiber reinforced plastic fibers forming the vane is arranged in parallel with two opposing surfaces of the slit of the rotor.

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